Previous : Queen vs Minor Pieces Fortress Part 1 - Two Bishops
Bishop and Knight alone can not hold the position against queen except one position, which can be arranged on two corner of the board, depending upon which colour bishop you have.
Bishop and Knight fortress
As you can see that white king can not enter into the squares marked with green colour. Therefore Bishop can not be captured so position remains draw. Moreover, white is not able to force black into zugzwang. Please note that attacker positions (here white's King and Queen) are irrelevant once defender gets the given position.
Originally position was studied by Max A.K.S. Karstedt in 1903 who has also discovered some other possibilities in Philidor position even but not popular because they are complicated.
Karstedt Position - 1903
Bishop and Knight alone can not hold the position against queen except one position, which can be arranged on two corner of the board, depending upon which colour bishop you have.
Bishop and Knight fortress
As you can see that white king can not enter into the squares marked with green colour. Therefore Bishop can not be captured so position remains draw. Moreover, white is not able to force black into zugzwang. Please note that attacker positions (here white's King and Queen) are irrelevant once defender gets the given position.
Originally position was studied by Max A.K.S. Karstedt in 1903 who has also discovered some other possibilities in Philidor position even but not popular because they are complicated.
Karstedt Position - 1903
1. Qf5 Kh8 2. Ke7 Kg8 3. Qc2 Kh8 4. Qc8+ Kh7 5. Qa8 Ng6+ 6. Ke6 Ne5 7. Qh1+ Kg8 and position remains the same.However here are some moves which are played by computer (F-13) with no result. 8. Qd5 Kh7 9. Kf5 Kh8 10. Qa8+ Kh7 11. Qb7 Kg8 12. Qe7 Kh7 13. Qe6 Bh8 14. Ke4 Bg7 15. Kd5 Bh8 16. Kd6 Bg7 17.Qd5 Kh8 18. Qe4 Kg8 19. Ke6 Kh8 20. Kd5 Kg8 21. Qf5 Bh8 22. Qc8+ Kh7 23. Qd8 Ng6
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